231 ) Which of the following gases is used in fire extinguishers?
(a) Oxygen
(b) Hydrogen
(c) Water vapour
(d) Carbon dioxide
The Answer Is: (d) Carbon dioxide
232 ) Stains of rust from iron on cloth can be removed by
(a) Hydrogen peroxide
(b) Alcohol
(c) Oxalic acid
(d) Petrol
The Answer Is: (c) Oxalic acid
233 ) Cooking gas is a mixture of which of the following two gases?
(a) Methane and Carbon dioxide
(b) Oxygen and Nitrogen
(c) Butane and Propane
(d) Oxygen and Methane
The Answer Is: (c) Butane and Propane
234 ) Nameplates made of brass get discoloured in air because of the presence of which of the following gases in the air?
(a) Oxygen
(b) Nitrogen
(c) Carbon dioxide
(d) Hydrogen sulphide
The Answer Is: (d) Hydrogen sulphide
235 ) On addition of salt to water, its
(a) Boiling point increases
(b) Boiling point decreases
(c) Boiling point is not affected
(d) Freezing point increases
The Answer Is: (a) Boiling point increases
236 ) Which one of the following has the highest fuel value?
(a) Mineral fuels
(b) Wood
(c) Coal
(d) Microbes
The Answer Is: (a) Mineral fuels
237 ) The characteristic odour of garlic is due to
(a) A chloro compound
(b) A sulphur compound
(c) A fluorine compound
(d) Acetic acid
The Answer Is: (b) A sulphur compound
238 ) Which of the following gases does not pollute air?
(a) Carbon dioxide
(b) Carbon monoxide
(c) Nitrogen dioxide
(d) Sulphur dioxide
The Answer Is: (a) Carbon dioxide
239 ) The inorganic natural resource of the earth is
(a) Hydrogen
(b) Charcoal
(c) Natural gas
(d) Gasoline
The Answer Is: (c) Natural gas
240 ) Which of the following groups of compounds constitute carbohydrates?
(a) Fats and sugar
(b) Fats, sugar, and proteins
(c) Starch, sugar, and proteins
(d) Starch and sugar
The Answer Is: (d) Starch and sugar
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